I received 2 missed calls from this line.
Upon returning their call each time, the phone line is either engaged or "your call could not be connected".

They called claiming to be from iPrimus and wanted some details (date of birth, address) which I wasn't willing to provide to an unsolicited call. I called iPrimus directly and they had no record of a call and nothing on my account that needed attention.

Careful!

Missed call called back and it’s engaged

Caller: (02) 8375 3876

Have missed this number before and I believe this is iPrimus phone/internet billing department

called number back and message says 'this mobile is currently unavailable' yet it's not a mobile number

Just received the call from this number telling me to call customer service of my line provider. It was recorded message because when I answered the phone they just played the message,! Are they trying to hook up to my line!!! Well, I will not call them however I will report that to my phone provider!

This number always disconnects straight after calling back wouldn't trust it at all

They left a message that didn't make sense. Their number is constantly engaged. Wouldn't trust it.

I called back number (02) 8375 3876 rang once then gets disconnected automatically.